Rubber-punching machine



H. F. MARANVILLE AND H. D. STEVENS.

RUBBER PU NCH|NG MACHINE. APPLICATION FILED OCT. 7. 1919.

Patented Oct. 18, 1921.

4 SHEETS-SHEEI I.

J azuzzulla H. F. MAHANVILLE AND H. 0. STEVENS.

RUBBER PUNCHING MACHINE. APPLICATION FILED ocr. 7, 1919.

Patented Oct. 18, 1921.

4 SHEETS-SHEEI 2.

7&30715 i ii z wae/ racefl 525609 7 G i? H. F. MARANVILLE AND H. D. STEVEN S.

RUBBER PUNCHING M'ACHINE.

APPLICATION HLED OCT. 1. 1919.

1,394,422, Patented Oct. 18, 1921.

4 SHEETS-SHEET 3 jwmam; ?f 3r%te i w H. F. MARANVILLE AND H. D. STEVENS.

RUBBER PUNCHING MACHINE.

APPLICATION FILED OCT. 7. 1919.

Patented Oct. 18, 1.921.

4 SHEETS-SHEET 4.

' use in cutting out ration of this stock have TBDL AT S- P N F n anvn'r r. MARANVILLE AND ironies n. srsvmvs, or mnemonic, ASSIGNORS "ro TEE mnsronnrma mo nouns coiurmr; or nxaon, 9310;; ,c'onrom'r on To all whom it may concern. 1 v Be it known that we, HARVEY F. MABAN- vrnnn and HORACE D United States, Summit, State of Ohio, have invented certain new and useful Improvements in Rubher-Punching lowing is a specification. a V

This invention relates to a machine for the purpose of cutting or punching out blanks of I articularly intended Y for blanks of .uncured or unvulcanized rubber. While it is shown as especially designed for the-purpose of cuttin out pieces of unvulcanizedrubber for rubber heel manufacture, it may be used for other purposes as willv be apparent.

fixed sizes, and is In the manufacture of rubber heels it is important that a suflicient quantity of rubber be placed in each cavity of the mold so that proper curing maybe obtained and a slight amount of overflow should be allowed.

Too much overflow is .not desirable as it is wasteful and increases the difiiculty of the trimming operation. For these reasons there has been here desi ed amachine which will accurately cut out t e proper amount of rubber, being readily'adjustable to .cut a greater or lessthickness of blank. Rubber in plastic, uncured condition is very hard to cut accurately and many diflicultles which have heretofore interfered with the* prepabeen overcome by the machine ofthis application.

While the showing is specific, it will be understood that the invention is not limited to the details, but may be varied without aifectin the-scope ofthe patent.

n the drawings: Figure 1 is a side elevation of Fig. 2 is a front elevation. I Fig. 3 is a plan. Fig. 4 is a longitudinal section on the line the machine.

' 4-4: of -F1g. 2

'whic to v Fig. 5 is .a section on the line 55 of Fig. 4 showing the mechanism for adjusting the depth of the plunger stroke.

Fi 6 is a view showing the manner in the blanks are cut from the stock.

The soft, plastic rubber from which the heels are formed is extruded froma die in the form of a long strip of approximately the thickness of the heel blank. This strip on blanks being designated 6 at 1, the heel of rubber is shown in Fig. h 1

yt e numera 2.

nunamrunoxme anemia 1 STEVENS, citizens ofthe residents of Akron, county of Machines, of which the folthe upper end of which is confined table freely,

.. bly threaded shaft 1 s ecmoatienvor letterslatcnt. P te t '0 t, 1 Application animator-7,1919. [trial in.

assess,

In Figr4 the upper surface of strips ls'shown by the dotted line 3.

the rubber? supported on a framework 6, the front end assing under a felt or fabric covered roller light arms 8 pivoted at 9 onthe framework 6, the pinslO limitin ment of the roller. ter from. a tank 11 1'2, dischargin By means of t e tank fed roller, the up er surface of the rubber strip is covered with a film of,water, which enables the die'parts of the machine uired. A metallic trough 13 is located unerthe roller 7 and serves to conduct away the overflow. 1 e In front ofthe framework 6 is secured a base plate orstandard 14 to the rear side of which is fastened a pair of brackets 17 in I he roller receives wa through a flexible pipe .which is rotatably mounted a shaft 18. "Centrally located on the shaft 18 is a feed .roll 19,.the outer surface of which is serrated or corrugated to grip. the under side." being provided with a} of the rubber strip, plurality of grooves 20, mto which are received a plurality of stripping fingers 21 pro ecting rearwardly from a table 22 adustably mounted on the rear of the stand through the slots ard 14 by bolts 23 passing mounted a presrollers .are arranged a pair of collars 29. In the ends of the shafts are screwed a pair of pins 30, the upper ends of which pass throughthe ends of brackets 31 secured on the upper ends of the extension 28. Around each pin is arranged a light coil spring 32,

y a washer 33.

The upper surface of the table 22 is provided with a plurality of ribs which serve This roller is supported on a pair ofi...

the downward move-fl} over the top ofthis roller.

to cutout the blanks as re on the shaft 26,

the brackets 17. Around the shaft 26 at the sides of' the to reduce the amount of surface contact with the rubber'so that it there being provided at the sides of the table adjustable guide plates 34, the adjustment being obtained by a reversi- 340 enga 'ng eyes 341 dependin from the guides. The main tions of t e guide plates are stationary, but

may be passed over the por- I w the forward ends are provided with ivoted plunger, locking'means for .the plunger be wings or extensions 35,\which ex'ten to the .gmg provided in anyv suitable way, here strip and causes it to spread outwardly. secured, by aset screw 70,,a com ressorhead' li ht sprin e feeding of the rubber is performs by -ment by a pair of co slide in any position is done by a hand nut 45.

, points opposite which the die acts upon the shown as a plug 690 forced against the screw en the threads by a sprin plun r691.

rubber and are arranged to yield .W

In the lower ha f of t e plunger rod is plunger descends or thedie enters the rubber The yielding movement is permitted by 71 which fits within the'die. e plunger 36 arranged as shown in Fi 3. rod is held at the upper limit of its movesprings 72 secured at a rotating crank arm 37 carrled upon the their lower ends to laterally projectin pins end-of a main shaft 38 which is rotatably 7 3 fastened in the upper half of the p unger mounted in bearings at the u per end ofrod. Across the two-standards 39 is secured uprights 39 secured to the stan ards 14. In a bridge piece 74 to .the center of which is order to provide for an adjustable feed of fastened a cross arm 75, in the extremities the rubber strips the crank .arm is formed. whereof are supported pins 76. The springs with aslot 40 in which is carried .a slide 41 72 are connected to'the pins 76. The upper support'ng the crank pin 42. Adjustment end of the plunger rod carries a roller 77 of t e sli e is obtained by .a screw shaft 43 whlch bears against a cam 78 formed midcarrying a nut '44, and the locking of the -wa of the shaft 38.

e arran ment of the cam and crank The pitman is indicated by the numeral 46 portion of t e main shaft 38 is such that -and is pivotally connected at 47 to a rockthe plunger is forced downwardly on the ing fan-shaped sector 48, which is pivoted top of the strip of rubber just before the on a stub-shaft 49 projecting from the die descends and is, held in that position bracket 17. Also mounted on the shaft 49 While the die'makes its cuttin stroke. This is'a ratchet 50 to the rear face of which is action on the part of the p unger or .comsecured a ear 51 in mesh with a gear 52 pressor serves to compress the rubber into keyed to t e shaft 18. On the rear face the exact thickness required for the blank. of the sector are carried a plurality'of pawls By adjustment of the two halves of the lun- 53- which are so arranged as to fall at difger rod the amount of rubber in each lank ferent points on the several ratchet teeth. ma bedefinitely determined.

This provides for aminute feed and prevents he main shaft 38 is rotated by means back. lash, which in a combination with the of a gear 79 on the end of the shaft, in mesh adjustable throw of the crank-pin assures with a inion 80 carried on a suitable shaft an accurate feed for any size die. which a so carries a gear 81 driven from any The main drive-shaft 38 carries at either suitable source of wer. 4

side of its'center between the uprights 39' Beneath the die 1s arranged a cutter block two crank portions 54 on which are carried 82 seated ina holder 83 which rests on a sleeves 55, to the lower sides of which are pair of wedges 84 and 85 so that vertical connected reversely screw threaded adjustadjustment may be obtained. The-wedges ing bolts 56. These bolts carry bearings 57 are adjusted by means of a set screw 86, which are pivotall connected to cutting threaded into a plate 87 secured on the block carrier 58, to t e lower side of which is base 14. secured a die or knife 59 of the shape of the Secured to rear of the support 14 is a air blank to be cut. The cuttingblock carrier is of brackets 88 into the up er ends of w ich slidably received in guideways 60 in the is secured a cross shaft 89 in the central porsides of the uprights and is arranged to cut tion of which is threaded an adjusting screw a single blank at each stroke, although the 90, the lower end being rovided with a head number may be increased if desired. 91 on which is pivota y mounted a clevis As shown in Fig. 5, the carrier 58 is or or yoke 92. The oke is held in alinement ranged with a central opening in which is with the body of t e screw by a light sprin received and guided a two part, 'lunger rod, 93. On the lower side of the clevis is carrie the upper part being designated by the nua stripper roller 94. The arrangement of meral 61 and the lower by, the numeral'62, the parts is such that the roller 94 rests on the two parts being connected by a reversely the surface of the rubber strip just back of screw threaded bolt 63. Between the two the die, the purpose being to prevent the ortions of the plunger rod the bolt is rubber from rising with the die upon its fbrmed with a'sma l toothed wheel 64. About return stroke. The movement allowed by the wheel 64 is arranged a casin 65 in which the jointed arrangement of the lower end of is slidabl mounted a pin 66, t e inner end the stripper arm is sufiicient to allow the 67 of which is pointed to enter between the roller 94 to withdraw if required by the in-.

teeth ofthe wheel, being forced inwardly by clination of the outer surface of the die a light coil spring 68; The head of the pin (Fig. 4). A pan of wing nuts 95 serve to is formed with a grip 69 by which the wheel hold the adjusting screw 90 in pro r posiis rotated to adjust the two halves of the tion and permit adjustment 9f e screw 13.

(fior varying thickness of stock or sizes of From the upper ends of the standards 39 are extended a pair of lugs ,96 from which are suspended hangers 97 which sustain a pair of rails 98. Between the rails 98 are suspended a plurality of rollers 99 on which the rubber strip is received after passing under the die.

In the operation of the machine, the operator places a length of uncured rubber of the, required cross section on the rollers 4 and between the feed roller 19 and the pres sure roller 25. As the strip passes under the roller 7, the upper surface receives a film of water which aids in the cutting of the rubher. The strip is advanced step by step by the feed roller 19 operated through the crank connection 46 and is guided by the members 34. As the die descends between the feeding strokes, the plunger or compressor 71 first presses the rubber to the proper thickness and holds it while the knife 59 descends and cuts out the blank. As the die descends the movable portion 35 of the guides give and permit the rubber to move outwardly as the knife enters it. The film of water on top of the rubber permits the knife to enter the rubber and prevents the latter from sticking to the plunger. The stripper roller 94 holds the rubber strip on the bed. The rubber strip with the heels cut out passes out onto the rollers 99 and the blanks may be removed by the operator.

During the operation of the machine the depth to which the plunger descends, and the consequent thicknessof the stock, may be regulated bylrthe adjustment of the two halves of the plunger, and the amount of feed may be varied by adjustment of the slide 41.

Changes and modifications may be made in the machine without departing from the spirit of this invention, and it will be understood that many alterations in detail fall within the scope of this invention.

We claim:

1. In a machine of the character described, thecombination of a die for cutting rubber stock, a compression plunger within'the die, and means causing the plunger to descend upon the rubber and compress it to a predetermined thickness prior to and during the operation of the die. i

2. In a machine of the character described, the combination of a die for cutting rubber, a compression plunger within said die, an unyielding means for causing the plunger ,to descend upon the rubber and compress it to a definite thickness prior to and during the operation of the die, and means for spreading a film of water upon the upper surface of the rubber.

3. In a machine of the character described. the combination of a die for cutting rubber, a plunger within said die, positively actufor actuating the die and plunger upon the rubber durm ated means for moving the plunger into contact with the rubber prior to the actuation tion .pf the die, and adjustable mechanism for regulating the depth of descent of th plunger.

5. n a machine of the character described, the combination of a die for cutting rubber stock, a plunger for compressing the stock to a predetermined thickness, feeding mechanism for advancing the stock through the machine, a guide for the stock extending at the sides of the die, and means for yieldingly holding said guide in place but permitting lateral movement thereof as the rubber is compressed.

6. In a machine of. the character described, the combination of a die for cutting rubber stock, a plunger for bringing the stock to a predetermined thickness, feeding mechanism for advancing the stock through the machine, means for wetting the upper surface of the rubber, guides for the stock extendin at the sides of the die, and means for yiel ingly holding said guides in place but permitting lateral movement thereof as the rubber is compressed.

7. In a machine of the character described, the combination of a die for cutting rubber stock, a compression plunger within said die, a two part rod for carrying said plunger, adjustable mechanism for connecting the two parts of said rod, and means for forcingsaid plunger on to said rubberduring'the movement of the die.

8. In a machine of the character described, the combination of a die for/cutting rubber stock, a compression plunger within said die, a two part rod for carrying said plunger, adjustable mechanism for connecting the two parts of said rod, means for forcing said plunger onto said rubber during the movement of the die. and means for covering the rubber stock with a film of water.

I 9. In a machine of the character described, the combination of a die for cutting rubber stock, a plunger within the die, an adjustable rod for supporting the fplunger, means or forcing the the movement of the die, a pair of yiel able guides at the sides of the stock, and a strip ing mechanism for removing the rubber rom the die.

HARVEY F, MARANVILLE.

HORACE D. STEVENS. 

